How to define pointer to pointer in C language? The following program demonstrates pointer arithmetic in void pointers. Basically the type of data that it . Cs void pointer function lets you type-cast them into other data types, enabling easy memory allocation. The declaration for void pointer is as follows . In the above code, we notice that since ptr . Because both x and ptr are int type . // The malloc() function returns void * which can be typecasted to any type like int *, char *, .. int main(void) Example #3 - Pointer to void. P = &c; // void pointer also holds char c address. A void pointer in C++ is a special pointer that can point to objects of any data type. According to the C language standard, the representation of a pointer to void is the same as the pointer of character datatype. A Void Pointer is a pointer that has no associated data type with it. This pointer lets you store and retrieve a different object type simultaneously. The void pointer, also known as the generic pointer, is a special type of pointer that can be pointed at objects of any data type! It means "no type", "no value" or "no parameters", depending on the context. How to create a pointer for strings using C language? void pointer in C. Till now, we have studied that the address assigned to a pointer should be of the same type as specified in the pointer declaration. In C programming, a void pointer is also called as a generic pointer. A void pointer can hold address of any type and can be typcasted to any type. GCC allows it as an extension, see Arithmetic on void - and Function-Pointers (note that this section is part of the "C Extensions" chapter of the manual). A void pointer can point to a variable of any data type. According to the C language standard, the representation of a pointer to void is the same as the pointer of character datatype. python for class xii. When you are not sure about the type of data that is going to store at a . It can point to any type of variables. A void pointer can be really useful if the programmer is not sure about the data type of data inputted by the end user. The value of float variable is= 37.75. For example, if we declare the int pointer, then this int pointer cannot point to the float variable or some other type of variable, i.e., it can point to only int type variable. A void pointer in C clearly indicates that it is empty and can only capable of holding the addresses of any type. It points to some data location in the storage means points to the address of variables. It would be incorrect, if we assign an address of a float variable to a pointer of type pointer to int. The size of the void pointer in the C programming language is the same as the size of the pointer of the character datatype. This means it points to the address of variables. python for class xi. For example: In the above snippet void pointer vp is pointing to the address of integer variable a. Agree Is it safe to delete a void pointer in C/C++? Let us understand this in detail, As we know, a pointer variable can store the address of the same type of variable as the pointer -variable declared i.e. What is void in C programming? In a way, memory allocation uses a format that lets the function pointer enhance other features. 11.14 Void pointers. What is a Void Pointer in C Programming? That means single void pointer can be used to store the address of integer variable, float variable, character variable, double variable or any structure variable. Your email address will not be published. Is it safe to delete a void pointer in C/C++? The void pointers in the C programming language are used to implement generic functions in C and which we already discussed at the beginning of this article. in other words, void pointer - void * - is a pointer that points to some data location in storage, which doesn't have any specific type. Void pointers are also known as generic pointers. In this above program, we declare two pointer variables of type void and int type respectively. No, that's not it. Following program illustrates the use of a void pointer: A void pointer is a pointer that has no associated data type with it. The void pointer in C is a pointer that is not associated with any data types. So in this case vp is acting as a pointer to int or (int *). Affordable solution to train a team and make them project ready. Further on, you will learn all about the coding techniques involving void pointers in C. Generally, void pointers are pointers without any related data type. Dangling Pointer in C. The dangling pointer is a non-null pointer that points to unallocated memory. It supports generic pointer type of data, as well. Another important point I want to mention is about pointer arithmetic with void pointer. Advantage of void pointers: malloc () and calloc () return void . Therefore, by type-casting, we can dereference void pointers. (falls out of researching some size_t issues on LLP32/LP64 difficulties;-) What do you mean by pointer to a constant in C language? 3. Explain the dynamic memory allocation of pointer to structure in C language. Final conclusion: arithmetic on a void* is illegal in both C and C++. A generic pointer means it can access and manipulate the data of any kind of variable. We also create another interger type variable data. void pointer is an approach towards generic functions and generic programming in C. Note: Writing programs without being constrained by data type is known as generic programming. Let me show you what I mean. pointerName is the name of the pointer. But you have to do typecasting to get a value. So, we have the pointers name to which we point and give an address allocation. void pointer in C; Chapter Index: void pointer in C C Tutorial. By using this website, you agree with our Cookies Policy. printf(The value of integer variable is= %d,*ptr ); However, running this code results in a compile-time error. The Generic pointer of C & C++ is called a void pointer. Here is the syntax of void pointer. { What is the size of void pointer in C/C++? The syntax for void pointer is given below , Following is the C program for void pointer , When the above program is executed, it produces the following result , Given below is the C program for pointer arithmetic in void pointers , Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. In the above code, we notice that since ptr is a void pointer, we can make it point to a variable of char type as well as a variable of int type. It points to some data location in the storage means points to the address of variables. When we are working with the void pointer, type specification will be decided at run time only. A null pointer is basically a null value assigned to a pointer of any data type whereas a void pointer is a data type which remains void as long as an address of a data type is not assigned to it.. We make use of First and third party cookies to improve our user experience. Learn more, Differentiate the NULL pointer with Void pointer in C language. In C, malloc () and calloc () functions return void * or generic pointers. So far, we have more than 4,000 customers worldwide. The void size is similar to a character pointer in C. The size object varies depending on the pointer platform. In other words, they are like empty containers. A void pointer declaration is similar . Implement the void* Pointer in C++ ; Size of the void* Pointer in C++ ; This article will discuss the uses of void* pointers in C++. Please read our previous articles, where we discussed the Null Pointer in C Language with Examples. On paper, they seem like a weird concept. When you run the above code, you will get the following error. A void pointer can hold address of any type and can be typecasted to any type. Typecasting, therefore, relates the data type declared alongside the void pointer. Explain the concept of pointer to pointer and void pointer in C language? ; After declaration, we store the address of variable data in a void pointer variable ptr. This type of pointer is essential for the GATE exam. In programming languages, certain concepts make coding so much easier. incrementation and decrementation of the pointer are restricted. Accessing Type cast operator is used for accessing the value of a variable through its pointer. It is also called the general purpose pointer. Usually, it would be best to use the right syntax to import any programming function. Advantages of void pointers: 1) malloc () and calloc () return void * type and this allows these functions to be used to allocate memory of any data type (just because of . Class 11 computer science notes . Syntax of Void Pointer. So, in the below example, we are not using the void pointer and this is the reason why we created three-pointers. It points to some data location in the storage means points to the address of variables. As we already discussed in our previous articles, the malloc() and calloc() built-in functions in C Language return void pointer (void *) and this is the reason why these two functions are used to allocate memory of any data type. As the void pointer can access and manipulate any kind of data variables, so it is also called a Generic Pointer. It is also known as a generic pointer. Of note, the above program compiles in C only. Some of them include: int num=10;//Initializes a normal variable. To define a void pointer in C, use the keyword void in your pointer declaration. I would like to have your feedback. If any pointer is pointing the memory address of any variable but after some . Hence the proper typecast in this case is (int*). Back to: C Tutorials For Beginners and Professionals. What is C Language History of C Features of C How to install C First C Program Compilation Process in C printf scanf Variables in C Data Types in c Keywords in c C Identifiers C Operators . Sample papers of class 12, Python notes , Study tips an tricks. This article covers what Void Pointer in C is and how it works with syntax & some examples. However, if the types of pointers (types of variables to which they point) are not same then we will have to do type casting of one of these to the type of the other to use assignment operator.However, the void pointer (void * ) can represent any pointer type. void pointer in C. Till now, we have studied that the address assigned to a pointer should be of the same type as specified in the pointer declaration. Instead, we use the indirection operator *. For that reason, it becomes necessary to type-cast in the absence of an associated datatype. By using this website, you agree with our Cookies Policy. In other words, a void pointer is a general purpose pointer that can store the address of any data type, and it can be typecasted to any type. There are two main parts : Referencing : In which you refer to a data value i.e, store the address of a variable to a pointer. Programmers find it useful because there are no data types associated with it. Furthermore, void pointers in C help carry out generic functions. Therefore, the syntax of a void pointer in C is: Void *pointer_name; Whereby "void" is the keyword of the type of pointer. Let us understand the need for a void pointer with an example. Output. In C programming language, a void pointer is a pointer variable used to store the address of a variable of any datatype. Memory allocation also gets easy with this type of void pointer in C. Further, these void pointers with addresses can be typecast into any other type easily. void *ptr = NULL; //void pointer variable, int *p = NULL;// integer pointer variable, char *cp = NULL;//character pointer variable, float *fp = NULL;//float pointer variable. Working. Let us learn about Void pointer in C programming and understand its implementation with an example, explanation, advantages, disadvantages and much more. Explain the concept of pointer accessing in C language. a function does not accept parameters. This is very useful when you want a pointer to point to data of different types at different times. However, note that void pointers do not support any arithmetic operation whatsoever. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. Please post your feedback, question, or comments about this article. Pointers are used to store address of any variable whether it be an integer, character, float, structure, etc. Application of void pointer in C; Function pointer in c, a detailed guide; How to use the structure of function pointer in c language? int type pointer-variable will only store the address of int type variable, int x = 6; int *ptr; ptr = &x; // right. So the proper typecast is (int*). }. Declare void pointer i.e void *ptr as mentioned below and assign the address of int variable we have declared. Explain the Union to pointer in C language. But, if you want to save time when coding, your go-to pointer function is a void pointer. A Void pointer has no datatype associated with it. Let us look at an example of declaring and initializing void pointer in C: void *ptr; char ch = 'N'; int num = 10; ptr = &ch; ptr = #. Usually, it would be best to use the right syntax to import any programming function. It can contain the address of variable of any data type. Before you apply pointer arithmetic in void pointers make sure to provide a proper typecast first otherwise you may get unexcepted results. Solution 1. For Example, void *ptr; // void pointer is used double d = 20.2; ptr = &d; // hence it becomes a valid statement. Code: //including c++ input and output libraries #include <iostream> using namespace std; //main method for run c++ application int main() { //declaring void pointer void* pointer; //declaring and initializing float variable float money = 55.50; //nitializing vooid pointer variable pointer = &money; // converting float to void ponter //displaying output cout . Here vp is a void pointer, so you can assign the address of any type of variable to it. The output becomes: (Void pointer make coding easier by revealing the location of data variables), // Note that the malloc() function returns void *, // Following up, type-cast to any data type such as char *, int *,. ; Now, we want to assign the void pointer to integer pointer, in order to do this, we need to apply the cast ooperator ie,. void pointer. Our focus, however, is on void pointers and how they work in C. To have a void pointer in C, you only need to declare a piece of information with the keyword void.. Therefore, the syntax of a void pointer in C is: Whereby void is the keyword of the type of pointer. We have studied that the pointer should be of the same data type to which it is pointing, as specified in the pointer declaration. #include <stdio.h> int main() { // void pointer void* ptr = NULL; Pointer Arithmetic in C. 10 questions about dynamic memory allocation. There are two different pointer types; generic pointers and void pointers. The assignment operator (=) may be used on pointers of the same type. A void pointer is created by using the keyword void. We have learned in chapter Pointer Basics in C that if a pointer is of type pointer to int or (int *) then it can hold the address of the variable of type int only. int a = 10; char b = 'x'; void *p = &a; // void pointer holds address of int 'a' p = &b; // void pointer holds address of char 'b'. Computer tricks. A Void Pointer in C can be defined as an address of any variable. It points to some data location in the storage. A void pointer is declared like a normal pointer, using the void keyword as the pointer's type: void* ptr; A void pointer can point to objects of any data type: The size of the pointer will vary depending on the platform that we are using. A void pointer is a pointer that has no associated data type with it. 1. void *pointerName; void indicates that the pointer is a void pointer. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Therefore, in a case where we include a void pointer variable, we have: Void *p = &b; // void pointer allocates and holds int b as address of integer. Dereferencing, in this case, is when you obtain a value stored in the pointer variable. 2. void pointer program in C++. int main () The pointer, on the other hand, is of type int. This is Statement is incorrect. A void pointer can hold address of any type and can be typcasted to any type. The program can be set in such a way to ask the user to inform the type of data and . The void pointers are used extensively in dynamic memory allocation which we will discuss next. 505 Xinhua Road Xinhua District, Shijiazhuang Hebei China. A void pointer is a pointer variable that has void as its data type and is not associated with any reference type. Let's see the below example. Agree Memory Layout in C. 100 C interview Questions; File handling in C. C format specifiers. Hence, in each print statement, we tell the compiler what sort of 'hole/void' we it is expected a to point to, and then we get that sort of value from that pointer. In the above program, we declare two pointers 'ptr' and 'ptr1' of type void and integer, respectively. float *fp; // floating pointer declaration. Get the newsletter delivered to your inbox, with helpful tips on PCB assembly and news from WellPCB. The void pointer is a general pointer that is used when we don't know the data type of the variable that the . void pointer. In C, malloc () and calloc () functions return void * or generic pointers. What are different pointer operations and problems with pointers in C language? A Computer Science portal for geeks. Home; C Programming Tutorial; Void Pointers in C; Void Pointers in C. Last updated on July 27, 2020 We have learned in chapter Pointer Basics in C that if a pointer is of type pointer to int or (int *) then it can hold the address of the variable of type int only. Hence, void pointers reduce excess type-casting. A Computer Science portal for geeks. integer, character, and float pointers. as in. They help point to variables of any data type. By far, the void pointer has vast relevance in C language programming. In the next article, I am going to discussDangling Pointer in C language. It can store the address of any type of object and it can be type-casted to any type. A void pointer is nothing but a pointer variable declared using the reserved word in C 'void'. For better understanding, see the code sample below. A void pointer in c is called a generic pointer, it has no associated data type. Explain the concept of Array of Pointer and Pointer to Pointer in C programming, Dangling, Void, Null and Wild Pointers in C/C++. A void pointer is not associated with any particular data type. It would be incorrect, if we assign an address of a float variable to a pointer of type pointer to int. For example, if we declare the int pointer, then this int pointer cannot point to the float variable or some other type of variable, i.e., it can point to only int type variable. An example code is also provided to demonstrate its implementation. For a better understanding, please have a look at the below example. #include <stdio.h> int main () { int a=90; void *ptr; ptr=&a printf ("Value which is pointed by ptr pointer : %d",*ptr); return 0; } In the above code, *ptr is a void pointer which is pointing to the integer variable 'a'. Learn more, Differentiate the NULL pointer with Void pointer in C language. The Size of the void pointer is 2 bytes. When we are working with the void pointer, arithmetic operations are not allowed, i.e. It is a general purpose pointer. The value of *ptr1: 2. C. A void pointer is a pointer that has no associated data type with it. Hence the term Generic pointer. This means you can use it to point to any variable type you want as shown in the code snippet below. As we already discussed in our previous articles, the malloc() and calloc() built-in functions in C Language return void pointer (void *) and this is the reason why these two functions are used to allocate memory of any data type. Note: A Void Pointer in C Programming Language is a pointer that has no associated data type with it and this is the reason why a void pointer in C programming language can hold the address of any data type and can be typecasted to any data type as well. This feature enables them to hold addresses of a type variable of unknown data type. that a is a pointer to some void (memory hole). // wrong since type of ip is pointer to int, // wrong since type of fp is pointer to float, // signal to operating system program ran fine, Operator Precedence and Associativity in C, Conditional Operator, Comma operator and sizeof() operator in C, Returning more than one value from function in C, Character Array and Character Pointer in C, Machine Learning Experts You Should Be Following Online, 4 Ways to Prepare for the AP Computer Science A Exam, Finance Assignment Online Help for the Busy and Tired Students: Get Help from Experts, Top 9 Machine Learning Algorithms for Data Scientists, Data Science Learning Path or Steps to become a data scientist Final, Enable Edit Button in Shutter In Linux Mint 19 and Ubuntu 18.04, Installing MySQL (Windows, Linux and Mac). A void pointer can hold the address of any type and can be type-casted to any type. A void pointer can point to a variable of any data type and void pointer can be assigned to a pointer of any type. In C, malloc() and calloc() functions return void * or generic pointers. Let us look at an example of declaring and initializing void pointer in C: void *ptr; char ch = 'N'; int num = 10; ptr = &ch; ptr = #. Class 10 IT (402) notes. It has no standard data type. Otherwise, running the program displays a compiler error. For example, the below program will not compile. int *p; // integer pointer declaration. Therefore, it is also a generic-purpose compiler. a pointer does not have a specific type and could point to different types. For a better understanding, please have a look at the below example. Here, in this article, I try to explain Void Pointer in C Language with Examples. void *pointername; For example void *vp; Accessing Type cast operator is used for accessing the value of a variable through its pointer. Hi, I am Hommer, the founder of WellPCB. The void pointer in C is a pointer which is not associated with any data types. A void pointer in C is a general-purpose pointer that can hold any data type's address and can be typecasted to any type. The dereference a dangling pointer may cause the program to crash. I.e. We also declare the integer type variable, i.e., 'a'. pointer to nothing? Note: typecasting changes type of vp temporarily until the evaluation of the expression, everywhere else in the program vp is still a void pointer. It is also called general purpose pointer. But void pointer is an exception to this rule. printf(void pointer size = %d\n\n,sizeof(ptr)); printf(integer pointer size = %d\n\n,sizeof(p)); printf(character pointer size = %d\n\n,sizeof(cp)); printf(float pointer size = %d\n\n,sizeof(fp)); Otherwise, see attached video link below on void pointer codes in C programming. We can't just dereference a void pointer using indirection (*) operator. In C, ptr1=ptr; // assigning void pointer to integer pointer type. Void pointer in C is a unique type of pointer that can point to any object's data type. Here is some example code: In this video we'll explain what a void pointer a. What is the size of void pointer in C/C++? Void Pointer in C. The void pointer is a pointer that can store an address of any data type. A void pointer is created by using the keyword void. Here we have assigned the name of the array one_d to the void pointer vp. while retrieving the value from void pointers you have to specify the variable type i.e * (variable_type *)ptr. So, if a pointer value is not associated with the available data types, you have type-casting as an option. A pointer pointing to a memory location that has been deleted (or freed) is called dangling pointer. The declaration for void pointer is as follows . Codeblocks IDESetup in Windows for C Program Development, Creating a new project using CodeBlocks IDE, Time Complexity of Recursive Function in C, Adding user defined functions in C Library, How to Change Case of Alphabets in a String in C, How to Count Vowels and Consonants in a String in C, How to Compare String and Checking Palindrome in C, Finding Duplicates in a String using Bitwise Operations in C, How to Check if 2 Strings are Anagram in C, How to Pass Array as a Parameter to a Function in C, How to Pass Structure as a Parameter to a Function in C, C Tutorials For Beginners and Professionals. In C, malloc () and calloc () functions return void * or generic pointers. Read more about cookies. Circuit Board Fabrication and PCB Assembly Turnkey Services WellPCB - Circuit Board Fabrication and PCB Assembly Turnkey Services, 3rd Floor, Nanhai Plaza, NO. I hope you enjoy thisarticle. The following program compiles as well as runs fine. The data type of the pointer is nothing but the type of data stored at the memory location where the pointer is pointed. Subsequently, this allows flexible functions like bytes in memory allocation. It does not have any standard data type. You will also learn the advantages, sizes, and uses of void pointers in C. For example, the void pointer determines the specific data type from an end users inputs in the C programming language. then we have stored the value from that void pointer to the variable val and we have printed that value. In this article, I am going to discuss Void Pointer in C Language with Examples. What's A Void Pointer in C? Installing GoAccess (A Real-time web log analyzer). Overall, referencing and dereferencing play a part in the general-purpose pointer concept. In such circumstances, void pointers (pointers to void) in C++ can be used. The size of the pointer will vary depending on the platform that we are using. Let us see, how we can replace the previous program with the void pointer. c language tutorial At least, we see its importance in addressing management and memory allocation. Required fields are marked *. Now the type of vptr temporarily changes from void pointer to pointer to int or (int*) , and we already know how to dereference a pointer to int, just precede it with indirection operator (*). Overall, the pointer function is essential for programming. void pointer is also known as general purpose pointer. Void pointer in C and C++ is a generic pointer that can point to any data types e.g. Void refers to the type. Void pointer is a specific pointer type - void * - a pointer that points to some data location in storage, which doesn't have any specific type. int *x = malloc(sizeof(int) * n); For some, this may read better if the * is attached to the 'type' rather than the name. These pointers can be used to point to the memory address of any variable irrespective of their data type. Function pointer in structure. The void pointer in C is a pointer which is not associated with any data types. Your email address will not be published. 1) Pointer arithmetic is not possible with void pointer due to its concrete size. The void pointer in C is a pointer which is not associated with any data types. So, while pointer arithmetic is invalid with void pointers, type-casting helps solve that problem. A void pointer is typeless pointer also known as generic pointer. class 12 computer science notes. 1) Pointer arithmetic is not possible with void pointer due . At least, it eliminates the confusion of pointers directing different values and data classes to each other. Alex June 21, 2022. In the below program, we have created three different types of pointers i.e. Hence, bringing us to discuss void pointers in C. Like others, void pointers have relevant functions for their flexibility. #include <stdio.h>. We use our own and third-party cookies to personalize content and analyze web traffic. We use the keyword "void" to create void pointer. These memory management functions are malloc () and calloc (). I really appreciate any help you can provide. Dangling Pointer in C Language: The most common bugs related to pointers and memory management in C Programming Language is Dangling/Wild Pointers. The void pointer function is an essential programming tool, in general. Clang and ICC likely allow void* arithmetic for the purposes of compatibility with GCC. // The malloc() function returns void * which can be typecasted to any type like int *, char *, .. void pointer in C / C++. void *ptr; // void pointer declaration. The following program demonstrates how to dereference a void pointer. That means, in place of constructing 3 types of pointers, we can create a single pointer variable that can access and manipulate any kind of variable properly, i.e. Sometimes as a programmer, we forgot to initialize the pointer with a valid address, and when we do so . Before you dereference a void pointer it must be typecasted to appropriate pointer type. C // C Program to show void pointer. It is a pointer that can hold the address of any datatype variable (or) can point to any datatype variable. With calloc() and malloc (), the void pointer helps allocate memory location for all data types. According to C standard, the pointer to void shall have the same representation and alignment requirements as a pointer to a character type. int, float and char etc. Mobile phone tricks.Python tutorial for beginners. By using a void pointer, when we are accessing the data then it is mandatory to use the Typecasting mechanism else it will give you an error. Moving on, we look at an example of void pointer arguments in the code snippet below: In the first of our code samples, we show how to use the malloc () function, thus: printf(pointed value by x pointer : %d,*x); In this next code, we show the type-casting concept. python for bca. In the next article, I am going to discuss. So, we have the pointer's name to which we point and give an address allocation. A void pointer in C language is a pointer that does not have any associated data type. Thus, any type of pointer may be assigned to a void pointer. You have a complete guide on working with void pointers in c. However, if you have inquiries or need other programming resources, our contact page is always available. We use it to indicate that: a function does not return value. If you use type-casting on the same code to dereference the pointer, you get the desired output, thus: printf(The integer variable value is %d, *(int*)ptr );// Dereferencing using typecasting. * indicates that the variable is a pointer variable. In return, these functions help allocate memory of the needed data type. It can be used to store an address of any variable. We can declare a void pointer in C using void keyword as shown below. After declaration, we assign the address of 'a' variable to the pointer 'ptr'. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Dereferencing a void pointer in C. The void pointer in C cannot be dereferenced directly. How to access the pointer to structure in C language? Please read our previous articles, where we discussed Void Pointer in C Language with Examples. We make use of First and third party cookies to improve our user experience. #include<stdio.h>. It is also called general purpose pointer. Online programming tools. Affordable solution to train a team and make them project ready. Last but not least, the void pointer variable helps implement generic functions in C. A generic function is a special function that focuses on logic without confining to data type. void pointer in C. void pointer is a pointer which is not associated with any data type. VOID POINTER in C, C++. Since the base type of one_d is a pointer to int or (int*), the void pointer vp is acting like a pointer to int or (int*). What is if __name__ == '__main__' in Python ? Void Pointer. How to define pointer to pointer in C language? Answer (1 of 6): I'll talk in context of C programming. int a = 10; char b = 'x'; void *p = &a; // void pointer holds address of int 'a' p = &b; // void . Going further, let us highlight some syntax examples: int i=6; // initialization of integer variable. Implement the void* Pointer in C++. If you have any questions, you can feel free to contact me. Declaration. Explain the concept of pointer to pointer and void pointer in C language? It is also called general purpose pointer. 1) The void pointers cannot be dereferenced. For example: It simply doesn't work that way!. Syntax of Void Pointer A void pointer in C is a pointer that does not have any associated data type. In such a case the programmer can use a void pointer to point to the location of the unknown data type. 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